Compare the same range on different worksheets - vba

Question

I have a workbook with multiple sheets (Sheet 1, 2...etc) and a "Master" Sheet. I need to select a range from columns A:C until it meets a row with the value (tva) (including those rows). I want to compare that range from Master to the other sheets, and highlight the differences.
Sample image For example Master sheet has in A3 value "m".
This is what I have so far. I'm pretty new at this so any advice is appreciated :)
Sub comp()
Dim ws As Worksheet
Dim rngCell As Range
For Each ws In ThisWorkbook.Worksheets
ws.Activate
rngCell = Columns("A:C").Resize(Columns("A:C").Find(What:="tva", After:=Range("A1"), LookIn:=xlValues, SearchDirection:=xlPrevious).Row)
rngCell.Select
For Each rngCell In ws.Range
If Not rngCell = Worksheets("Master").Cells(rngCell.Row, rngCell.Column) Then
rngCell.Interior.Color = vbYellow
End If
Next ws
End Sub

Answer 1

You can try following code, although it is did not cover other column, but small adjustment only need to check until column C (col 3):
Sub comp()
Dim ws As Worksheet
Dim valuerow As Long, irow As Long
For Each ws In ThisWorkbook.Worksheets
ws.Activate
valuerow = Cells.Find(What:="tva", After:=Range("A1"), LookIn:=xlValues, SearchDirection:=xlPrevious).Row
For irow = 1 To valuerow
If ws.Cells(irow, 1).Value <> Worksheets("Master").Cells(irow, 1).Value Then
ws.Cells(irow, 1).Interior.Color = vbYellow
End If
If ws.Cells(irow, 2).Value <> Worksheets("Master").Cells(irow, 2).Value Then
ws.Cells(irow, 2).Interior.Color = vbYellow
End If
Next
Next
End Sub